scholarly journals U-Pb Age, by Zircon, of the Pre-Klesiv Breed Association of the Osnytsky Block

2021 ◽  
pp. 80-88
Author(s):  
O.B. Vysotsky ◽  
◽  
L.M. Stepanyuk ◽  
L.V. Shumlyanskyy ◽  
◽  
...  
Keyword(s):  
Regional Metamorphism ◽  
Structural Rearrangement ◽  
Medium Composition ◽  
Eastern European ◽  
Initial Stage ◽  
Icp Ms ◽  
Intrusive Rocks ◽  
Stratigraphic Position ◽  
New Type ◽  
Plutonic Belt

The Osnytsky block is an integral part of the Osnytsky-Mikashevytsky volcanic-plutonic belt, represented by early proterozoic igneous rocks of different compositions. This is a new type of igneous belts for the early precambrian – a paleotypical analogue of intracontinental volcanic-plutonic belts by the phanerozoic, which was formed in the conditions of mature continental crust in the initial stage of radical structural rearrangement of the cratonized gneiss base of the Eastern European platform. Volcanogenic formations have undergone regional metamorphism at a level not higher than the epidote-amphibolite facies, classified in the klesiv series, which combines effusives of basic, acidic and medium composition and occupies a higher stratigraphic position compared to the metamorphites of the teteriv series. Intrusive rocks (gabbro-diorite-granodiorite granite association) – to the osnitsky complex. Rocks of the osnitsky complex are widespread, they account for 80-85% of the area of the Osnitsky block. The pre-klesiv association, represented mainly by gneisses of the teteriv series and plagiogranitoids of the sheremetivsky complex, has a limited distribution. The LA-ICP-MS U-Pb method was applied to date zircon from plagiogranite and plagiomigmatite of the sheremetivsky complex, and from gneiss and amphibolite. The plagiogranite yielded an age of 2110 ± 8, and plagiomigmatite of 2165 ± 22 Ma. Hence, granitoids of the sheremetivsky complex in the Osnitsk block were formed between 2.16 and 2.11 Ga. The age of the metamorphism of gneisses was defined as 2198 ± 29 Ma, whereas zircon from amphibolite crystallized at 1981 ± 36 Ma. Correspondingly, gneiss can be attributed to the teteriv series, whereas amphibolite can belong to either osnitsky complex, or nartsyzivsky complex.

Stages of Late Palaeozoic deformation and intrusive activity in the western part of the North Patagonian Massif (southern Argentina) and their geotectonic implications

2008 ◽  
Vol 146 (1) ◽  
pp. 48-71 ◽  
Author(s):  
W. VON GOSEN
Keyword(s):  
Regional Metamorphism ◽  
The North ◽  
Magmatic Rocks ◽  
Late Palaeozoic ◽  
Intrusive Rocks ◽  
Gondwana Margin ◽  
Intrusive Activity ◽  
Magmatic History ◽  
Crust Deformation ◽  
Deformational Event

AbstractAnalyses of structures in the western part of the North Patagonian Massif (southern Argentina) suggest a polyphase evolution, accompanied by continuous intrusive activity. The first two deformations (D1, D2) and metamorphism affected the upper Palaeozoic, partly possibly older Cushamen Formation clastic succession and different intrusive rocks. A second group of intrusions, emplaced after the second deformational episode (D2), in many places contain angular xenoliths of the foliated country rocks, indicating high intrusive levels with brittle fracturing of the crust. Deformation of these magmatic rocks presumably began during (the final stage of) cooling and continued under solid-state conditions. It probably coincided with the third deformational event (D3) in the country rocks. Based on published U–Pb zircon ages of deformed granitoids, the D2-deformation and younger event along with the regional metamorphism are likely to be Permian in age. An onset of the deformational and magmatic history during Carboniferous times, however, cannot be excluded. The estimated ~W–E to NE–SW compression during the D2-deformation, also affecting the first group of intrusive rocks, can be related to subduction beneath the western Patagonia margin or an advanced stage of collisional tectonics within extra-Andean Patagonia. The younger ~N–S to NE–SW compression might have been an effect of oblique subduction in the west and/or continuing collision-related deformation. As a cause for its deviating orientation, younger block rotations during strike-slip faulting cannot be excluded. The previous D2-event presumably also had an effect on compression at the northern Patagonia margin that was interpreted as result of Patagonia's late Palaeozoic collision with the southwestern Gondwana margin. With the recently proposed Carboniferous subduction and collision south of the North Patagonian Massif, the entire scenario might suggest that Patagonia consists of two different pieces that were amalgamated with southwestern Gondwana during Late Palaeozoic times.

scholarly journals Approaches to Studying Intermediality in Contemporary Cinema

2018 ◽  
Vol 15 (1) ◽  
pp. 165-187 ◽  
Author(s):  
Ágnes Pethő
Keyword(s):  
Media Studies ◽  
Eastern European ◽  
Approaches To Studying ◽  
Theoretical Approaches ◽  
European Cinema ◽  
Expanded Cinema ◽  
New Type ◽  
Contemporary Cinema

Abstract The article attempts a brief overview and evaluation of the main theoretical approaches that have emerged in the study of cinematic intermediality in the last decades since intermediality has become an established research term in media studies. It distinguishes three major paradigms in theorizing intermedia phenomena and outlines some of the directions of change in the intermedial strategies of recent films. It identifies in contemporary cinema a tendency to add new dimensions to the relations of in-betweenness regarding both the connection of cinema to reality and its inter-art entanglements. Finally, the article describes a new type of intermediality, which integrates elements of trans-textuality, creating a format of expanded cinema within cinema. This strategy is presented in the context of Eastern European cinema through a short case study of Cristi Puiu’s film, Sieranevada (2016).

Paleomagnetic study of lower Mesozoic diabase dikes and sills of Connecticut and Maryland

1976 ◽  
Vol 13 (4) ◽  
pp. 597-609 ◽  
Author(s):  
Timothy E. Smith
Keyword(s):  
Middle Jurassic ◽  
Pole Position ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Sea Floor ◽  
Good Convergence ◽  
Faunal Assemblages ◽  
Paleomagnetic Study ◽  
Intrusive Rocks ◽  
Stratigraphic Position

Paleomagnetic results from 61 sites on diabase dikes and sills in Connecticut and Maryland yield a mean pole of position of 100.9 °E. 68.6 °N, α95 = 1.6°. These results combined with those from 7S sites on four diabase sills in the Gettysburg Basin of Pennsylvania produce a mean pole position of 101, 6 °E. 65.4 °N, α95 = 1.3 °from 139 VGPs. These rocks arc probably of Early to early Middle Jurassic age by stratigraphic and inferred stratigraphic position. The paleomagnetic results indicate that the Gettysburg and Hartford Basins did not subside simultaneously.The dispersion of virtual geomagnetic poles about the mean pole of the Connecticut, Pennsylvania, and Maryland intrusive rocks is probably the result of 'homogenization' of magnetic directions during low-temperature oxidation of titanomagnetite to titanomaghemite over a period long enough to erase a considerable amount of dispersion due to secular variation.Rotation of Europe against North America in the prerifting configuration causes good convergence of European Jurassic mean poles and the pole of the Connecticut. Maryland, and Pennsylvania intrusive rocks. This is evidence that separation of the two continents had not begun by Early to early Middle Jurassic time, which is in agreement with earlier findings based on sea-floor magnetic anomalies and faunal assemblages.

The Ore-forming Epoch of the Jiapigou Gold Belt, NE China: Evidences from the Zircon LA-ICP-MS U-Pb Dating of the Intrusive Rocks

2014 ◽  
Vol 88 (s2) ◽  
pp. 1029-1030 ◽  
Author(s):  
Qingdong ZENG ◽  
Zaicong WANG ◽  
Song ZHANG ◽  
Yongbin WANG ◽  
Yueheng YANG ◽  
...  
Keyword(s):  
Ne China ◽  
Icp Ms ◽  
Intrusive Rocks ◽  
Jiapigou Gold Belt

scholarly journals QUÍMICA MINERAL E IDADES U-Pb DE MONAZITAS DE PLACERS MARINHOSDA REGIÃO NORTE FLUMINENSE

2012 ◽  
Author(s):  
Elizabeth Kerpe Oliveira ◽  
Bernhard Bühn ◽  
José Marques Correia Neves ◽  
Alexandre de Oliveira Chaves ◽  
Mário Luiz de Sá Carneiro Chaves
Keyword(s):  
Rio De Janeiro ◽  
Regional Metamorphism ◽  
Mineral Chemistry ◽  
Campos Basin ◽  
Icp Ms ◽  
Placer Deposits ◽  
Homogeneous Composition ◽  
Janeiro State ◽  
Geological Context

Este trabalho abrange o estudo de química mineral e geocronologia U-Pb de grãos de monazita, composicionalmentehomogêneos, provenientes de várias jazidas explotadas pelas Indústrias Nucleares do Brasil (INB) em placers marinhos da região de Buena,litoral norte fluminense. A área está localizada na região da Bacia de Campos e, geologicamente, pertence à Província TectônicaMantiqueira, que representa um sistema orogênico neoproterozóico desenvolvido na borda sudeste do Cráton São Francisco. As idades UPbobtidas por LA-ICP-MS abrangem um intervalo entre 486 Ma e 579 Ma, sendo que as idades mais jovens são de grãos de monazitas ricosem cério. Por outro lado, as idades mais antigas correspondem a grãos de monazitas com tendência à composição cheralítica, nos quaisocorre um enriquecimento principalmente em CaO e ThO2. A comparação dessas idades com informações geológicas regionais permiteinferir as suítes G2 (granitos granada-biotita gnaisse foliado) e G3 (leucogranitos, não deformados, encaixados em G2) como rochas-fonteda população de monazita mais antiga, suítes estas relacionadas com o arco sin-colisional desenvolvido simultaneamente aometamorfismo e à deformação regional Neoproterozóica. Já a população de monazita mais jovem pode ser proveniente de corposgraníticos das suítes G4 (plútons magmáticos zonados) e G5 (ballons magmáticos), representantes das fases pós-colisionais.Palavras-chave: Monazita, quimica mineral, idades U-Pb, LA-ICP-MS. ABSTRACTMINERAL CHEMISTRY AND U-Pb AGES OF MONAZITE FROM MARINE PLACERS OF THE NORTHERN RIO DE JANEIRO STATE - Thisresearch focusses on mineral chemistry and U-Pb geochronology of monazite grains of homogeneous composition, originating from severalmarine-placer deposits exploited by Indústrias Nucleares do Brasil (INB), in Buena, northern Rio de Janeiro State. Buena is located close tothe Campos Basin and related to the geological context of the Mantiqueira Tectonic Province, which represents a neoproterozoic orogenicsystem developed in the southern edge of the São Francisco Craton. Uranium-Pb ages by LA-ICP-MS fall between 486 Ma and 579 Ma.Younger ages are related to Ce-rich monazite. Older ages correspond to monazite with cheralitic signature, chiefly enriched in CaO andThO2. These ages are interpreted in the geological context of the Mantiqueira Tectonic Province as rock sources for older monazites, whichare correlated to syn-collisional arc simultaneously developed together the neoproterozoic regional metamorphism and deformation. Theyounger monazites came from granitic plutons of G4 and G5 suites, related to post-collisional phases.Keywords: Monazite, mineral chemistry, U-Pb ages, LA-ICP-MS.

scholarly journals Discrete mathematical model of travelling wave of conveyor transport

2020 ◽  
Vol 168 ◽  
pp. 00030
Author(s):  
Viktor Kravets ◽  
Volodymyr Samusia ◽  
Dmytro Kolosov ◽  
Kostiantyn Bas ◽  
Serhii Onyshchenko
Keyword(s):  
Mathematical Model ◽  
Travelling Wave ◽  
Technical Parameters ◽  
Wave Transport ◽  
Initial Stage ◽  
Discrete Phase ◽  
New Type ◽  
Technical Possibility ◽  
Discrete Mathematical Model ◽  
Phase Angles

A mathematical model of a travelling wave in a matrix form is constructed. A degree of discreteness of the travelling wave and corresponding steps in phase and length are introduced. Asymmetric, unified matrices are compiled, which represent a generalized travelling wave, depending on a degree of discreteness. A generalized, dimensionless travelling wave is transformed into a required one with dimensions by specified technical parameters: amplitude and wavelength that is realized. A dependency of coordinates of points of a plane discrete travelling wave and discrete phase angles is established. A dependency of angular (phase) velocity and velocity of the travelling wave, which corresponds to the known results, is established. The presented matrix mathematical model is considered as an initial stage of technical possibility to realize a continuous travelling wave in a discrete form when developing a new type of transportation – wave transport.

Control of Nano-Precipitates in Age-Hardenable Aluminum Alloys and Their Mechanical Properties

2005 ◽  
Vol 475-479 ◽  
pp. 337-342 ◽  
Author(s):  
Tatsuo Sato ◽  
Shoichi Hirosawa
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Mg Alloys ◽  
Phase Decomposition ◽  
Nano Scale ◽  
Initial Stage ◽  
Negative Effect ◽  
New Type ◽  
Microalloying Elements ◽  
Strength And Ductility

The nano-scale precipitate microstructures and properties of age-hardenable aluminum alloys such as Al-Cu, Al-Mg-Si and Al-Zn-Mg alloys were investigated using conventional electrical resistivity and hardness measurements, TEM and 3D-AP techniques. To increase mechanical strength and ductility of the alloys nano-scale precipitates were effectively controlled by applying new type heat treatments and microalloying elements. In the initial stage of phase decomposition of the alloys containing microalloying elements several types of nanoclusters were formed and distinctly detected by the 3D-AP technique. These nanoclusters greatly affect the nucleation of the subsequent precipitates and resultantly mechanical properties. In Al-Mg-Si and Al-Zn-Mg alloys complicated two-step aging behaviors were found to be originated in the positive or negative effect of the nanoclusters with different structures.

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